That's due to the Spaces/Launch Control stuff. Check in System Preferences and see what you find under Mission Control.
I have asked the questions several times, but no good answer has come back. Is the solution in the Sys pref or is the answer no one knows.
Under System Preferences->Mission Control, look for things like the items highlighted in the image below. They are Control-up-arrow and Control-down-arrow respectively. If you replace them with something else (e.g. F9 or F10), or the "nothing" option, you then get the old next/previous record behaviour in FIleMaker.
When you first told me that I thought I needed to make the changes you suggested, but did not want to effect the Mission Control. But I don't use that much anyway. Having the record advance function back is much more important.
It worked. Thanks.